Connection Characteristics of High Nitrogen Steel Electron Beam Welding

Abstract

High nitrogen steel of electron beam welding was studied. The highest tensile strength is 919.2Mpa which strength reaches 83.6% of the base metal. Organizations of joint were observed. The results show that austenite is the main organization, and there is a small amount of C/Cr precipitates in the weld zone. Grains of heat affected zone are significantly enlarged. The austenite in the weld zone is mainly in the form of dendrite. And growth direction is perpendicular to the fusion line. The softening range of joint is about 4mm. Hardness is decreased approximately by 20%. The N element content of HNS joint is only half of the parent material with EBW.